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Agenda •Grade test •Turn in Homework •Peanut Lab

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Test 1.Nothing 2.Standard Temp and Pressure 3.Faster 4.A 5.D 6.C 7.C 8.D 9.A 10.C 11.B 12.C 13.B 14.B 15.B

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Problem Section 16. PV=nRT (1) (2515torr)(.250L)=n(62.4 torr*L / K*mol )(300K) (1).0336mol * 28 g / mol =.940 g (3) Sig figs, answer, unit

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Problem Section 17.P T =P 1 +P 2 … (1) (750mmHg)(.78N 2 )= P 1 (1) (750mmHg)(.21O 2 )= P 2 (750mmHg)(.01Ar)= P 3 P 1 =585.0mmHg P 2 =157.5mmHg P 3 =7.5mmHg (3) Sig figs, answer, unit

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Problem Section 18. PV=nRT (1) (50.6kPa)(10L)=n(8.31 kPa*L / K*mol )(200K) (1).304mol * 6.02 EE 23 molecules / mol = (3) 1.83 EE 23 molecules Sig figs, answer, unit

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Problem Section 19. √MM b =Time b (1) MM a Time a √71 g / mol =Time b (1) 40 g / mol 120s x = 160s (3) Sig figs, answer, unit

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Problem Section 20. PV=nRT (1) (P)(.200L)=(4.00 mol )(.0821 atm*L / K*mol )(293K)(1) 481atm (3) Sig figs, answer, unit

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Problem Section 21.PV=nRT (1) 9.38 gMg 3 N 2 /100.9 g / mol =.0930 molMg 3 N 2.0930 molMg 3 N 2 * 4 molNH 3 /2 molMg 3 N 2 =.186 mol (784 mmHg )(V)=(.186 mol )(62.4 mmHg*L / K*mol )(298 K ) (1) 4.41 L (3) Sig figs, answer, unit

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Problem Section 22. √MM b =Volume a (1) MM a Volume b √x g / mol =25.0mL (1) 38 g / mol 15.0mL X=106 g / mol (3) Sig figs, answer, unit

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Skip 23-29

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Phase Diagram 30. White board 31.Melt 32.Increase the temperature or decrease the pressure 33.Decrease temperature and pressure 34.Increase pressure

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Peanut Lab

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